One-way pull latch



Patented June 7, 1927.

* UNITED- S T FREDERICK WILLIAM STAHL, or PHILADELPHIA, PENNSYLVANIA.

ONE-WAY PULL'LATo H.

Applicationfiled February 13, 1922. Serial No. 536,093;

The present device provides means whereby the transom or other swinging. instrumentality can be controlled by the pull cord that is used to release the locking bolt from its keeper. The rock shaft that carries a rocking arm to which latter the pull cord is attached, is provided with means by which the initial movement of the pull cord disengages the bolt from the keeper, and also with means which, immediately upon this disengagement,holds the rock shaft and the rocking arm to which the pull cord is attached, so that further rotation of the rock shaft is stopped and the rock-shaft and rocking arm are held in a position fined relatively to the transom; thus, (the pull cord being held in the hand) the transoms swing from its vertical position-is stopped immediately after the bolt is disengaged from its keeper and before the transom has attained any momentum and is still usually nearly vertical; and the transom being nowfree from its fastening and held by the pull'cord only, can be lowered without a ar to any desired-position by the holder of the cord paying it out, andheld in such position by securing t-hecord- No other means than the use of the pullcord is requisite for these purposes. I

The present device has a throw-cit,- and a boltwith a yielding abutment. The part engaging with the abutment is a-roeker fin,--tl1e spindle carrying which is rocked by a rocking arm pulled by the release and close cord and carries a stop that engages witlra sta-' tionary part of the latch. The contacting of the stop with this part of the lfAtCh llnHtS the rocking of the rocker spindle and the cord will close the transom or other swinging.

instrumentality by pulling on the rocking arm. By properly positioning the rocking fin and the stops relatively when carried as above stated by a rocking shaft, the bolt can be withdrawn from the keeper, (when, of course, the throw-oil will at'onepush it free) and the stop be made almost immediately to limit the rocking of the shaftso that hardly any jerk is produced upon the cord, by means of which the transom or other instrumentality may then be lowered yieldingly and without shock or jar to its downward position without the need for any other means for limiting the motion of the transom.

Describing the best form of device of which I amat present aware :Fig. 1 is a plan view of the bottom plate with the easing and removable parts removed; Fig. 2 is a plan view of the bottom plate with the re- I110Vlb18 parts inplace, but the casing removed}: Figs. 3, 4 and 5 are diagrammatic sections on line 33 of Fig. 2,-illustrating the detailed'action of the stops, rocking spindl'e, rocker fin, yielding abutment, bolt and; adjacent parts. Fig. 6 is an inside view'ot' the casing. Fig. 7 is aside elevation of the assembled latch.- Fig- 8 a view of a portion ofthe opposite side of the rocking spindle 'from' that shown in Fig. 2. All figures except- Fig. 7 are drawn to an enlarged scale to exhibit clearly the details. I

The plate 1, has integral therewith the standards 3, 1, 5, and 8, which support the spindle, 18, of the throw-ofi' and the rocking spindle, 16. These standards alsoposition casing, 9, the position of the side walls of;

whichis indicated in dotted lines' One of each pair of these standards is provided with journals in the usual manner, but the other of them is provided with a half round bearing, which, together with half round bearings, 27 and 28 journal the spindles, 16 and 18. A guide standard, 7, having a guide hole is placed adjacent to the bolt guide, 6. 2, 2, 2, 2, are screw holes. The throw-off has a spindle, 18, to which the presser arm, 17, is

attached. Its tension is given by the spring,

10, running between the standard, 5, and

the collar, 11; The bolt engaging device must necessarily first withdraw the bolt and then by a further pull in the same direction disengage itself from'and release thebolt. It also has to get back into its original position relative to the bolt. The engaging device, therefore, or the abutment is made yielding so that itwill be pushed back by the other of these devices and allow the latter toget back to its original position. The spindle, 16, has" the fin, 26, which engages with the abutment, 21. The springing arm, 20, is hinged to bolt, 12, by the pivot, 25, and impelled from it by the spring, 13. The up per part of the springing arm forms a guide to prevent the fin from getting behind the arm, 20. The bolt, 12, is guided in the guide, 6, and by the pin, 23, working in the guide hole in the guide standard, 7, and is impelled by the spring, 22. The shaft, 16, carries the stop, 14:, that limits-the rocking movement by contacting With the top of the casing, 9. This stop is arranged relatively to the fin, 26, so'that the former will contact with the wall of the casing immediately after the latter has disengaged from the abutment, 21. The

l rocking spindle and its movement in this direction is limited by the stop, 14 contacting with the casing, 9. The casing, 9, has slots, 27 and 28 with rounded tops that co-operate with the standards, 8 and 3 to form the bearings for the spindles, 16, and 18. This facilitates the assembly of the device. Before operating the cord the bolt stands as in Fig. 3. The slot 29 guides the bolt, 12.

When the device is operated the pull cord 30 is pulled bringing the fin, 26, into engagement with the abutment, 21, which it presses down releasing the bolt 12 from the keeper (not shown and forming no part of the invention), and bringing the parts of the device into the position shown in Fig. 4. The throw-off then comes into action and immediately the parts take the position shown in Fig. 5. The further rotation of the rock shaft is instantly stopped, before the transom has swung more than a few degrees, and before it'has gathered any momentum, and it is held by the pull cord in this position being merely disengaged from the keeper. The cord is then released gradually and the amount of opening of the transom or other closure regulated by it. Ordinarily, the closures Weight will overcome the resistance of the spring, 31. Closing is effected by pulling the cord. The cord is then released and the spring, 31 and weight of arm, 24:, will return the spindle, 16, to its original position.

I claim:

1. In a one way pull latch, the combination with the pull cord of a rock shaft having a rocking arm to which said pull cord is attached, said rock shaft being rockable in one direction by the pulling of said pull cord, a spring in position to rock back the rock shaft in the reverse direction into its original position, a springing locking bolt,

provided with an abutment for retracting said bolt, secured upon the same, a fin positioned upon the rock shaft to engage with the abutment of the bolt when the pull cord is drawn, thereby drawing inward the locking bolt when the rock-shaft is rocked by the pulling of the pull cord, said fin being also so positioned on the rock shaft and projecting therefrom to such a distance only as will cause it to slip off from and release said abutment when the rock shaft is rocked to its furthest position in one direction, a stop positioned to arrest the rocking of the rock shaft in such direction substantially so soon as the fin'releases said abutment, and means for allowing the [in to pass the abutment without moving the locking bolt when the rock shaft is rocked by the spring in the reverse direction to the direction in which it is rocked by the pull cord.

2. The device as defined in elaiin 1, with this additional element, and a throw off, operating when the bolt is drawn inward.

3. In a one way pull latch, the combina tion with the pull cord, of a rock shaft, having a rocking arm to which said pull cord is attached, said rock shaft being rockable in one direction by the pulling of said pull cord, a sprin in position to rock back the rock shaft in the reverse direction into its original position, a springing locking bolt provided with an abutment for retracting said bolt pivoted upon the same, a fin positioned on the rock shaft so as to engage with the abutment of the bolt, when the pull cord is drawn, thereby drawing inward the looking bolt when'the rock shaft is rocked by the pulling of the pull cord, said fin being positioned on the rock shaft and projecting therefrom to such a distance only as will cause it to release the abutment substantially as the rock shaft is rocked to its farthest position by the pull cord, a stop positioned to arrest the rocking of the rock shaft substantially as soon as the fin releases said abutment, and a spring interposed between the locking bolt and the abutment positioned to press yieldingly the upper part of said abutment away from the bolt.

F. WILLIAM STAHL. 

